Magnetic disk device

Abstract

The invention relates to a magnetic disk device. A magnetic disk device includes: a disk rotatable in a rotation direction; and a shroud at least partially surrounding the disc along the outer edge of the disc at a gap from the outer edge of the disc. The guide vane is connected to the shroud on the downstream side of the airflow generated in the rotational direction. The guide vane has a structure that decelerates the airflow between the guide vane and the disk.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based upon and claims the benefit of priority from Japanese patent application No. 2023-151959, filed on September 20, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments described herein generally relate to magnetic disk devices. Background Art

[0004] When particles such as dust adhere to the surface of a disk rotating at high speed in a magnetic disk device, the disk surface may be damaged or data read / write errors may occur. Therefore, there is a need for a magnetic disk capable of reducing the amount of particles adhering to the disk. Summary of the invention

[0005] The problem to be solved by the present embodiment is to provide a magnetic disk capable of reducing the amount of particles adhering to the disk.

[0006] One embodiment provides a magnetic disk device, comprising:

[0007] a disk rotatable in a rotation direction;

[0008] a shroud at least partially surrounding the disk along the outer edge of the disk at a gap therefrom; and

[0009] a guide vane connected to the shroud on a downstream side of the airflow generated in the rotation direction,

[0010] The guide vane has a structure for decelerating an airflow between the guide vane and the disk.

[0011] In addition, one embodiment provides a magnetic disk device, comprising:

[0012] a disk configured to be rotatably driven by a rotation axis;

[0013] a shield at least partially surrounding the disk along the outer edge of the disk with a gap therebetween; and

[0014] a guide vane having one end connected to an end of the shroud;

[0015] Wherein, the distance between the guide vane and the disk is greater than the distance between the shroud and the disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an example of a schematic diagram of the magnetic disk device according to the first embodiment.

[0017] Figure 2 It is along Figure 1 A cross-sectional view taken along line XY in FIG.

[0018] Figure 3 is an example of a schematic diagram of a magnetic disk device when the disk is stopped.

[0019] Figure 4 It is an enlarged view of the vicinity of the guide blade of the magnetic disk device in the first embodiment.

[0020] Figure 5 This is a schematic diagram showing the flow direction in an enlarged view of the vicinity of the device side area in the first embodiment.

[0021] Figure 6 This is a schematic diagram showing the flow direction in an enlarged view of the vicinity of the device side area in the second embodiment.

[0022] Figure 7 This is a graph comparing the amount of particles adhering to the disk surface.

[0023] Figure 8 is an example of an enlarged view of the guide vane in the third embodiment. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present invention are disclosed below.

[0025] The technical features including the configurations and controls of the embodiments and modifications described below, and the actions, results, and effects brought about by the configurations and controls are merely examples.

[0026] In addition, similar components are included in the multiple embodiments illustrated below. The same components are represented by the same reference numerals; therefore, redundant descriptions thereof will not be given below.

[0027] As used herein, the direction in which the plurality of trays 11 are stacked may be referred to as the height direction. Figure 1 The direction toward the front side of the paper in the drawing may be referred to as an upward direction, and the direction toward the back side of the paper may be referred to as a downward direction.

[0028] (First embodiment)

[0029] Figure 1 1 is an example of a schematic diagram of the inside of the magnetic disk device in the present embodiment. The magnetic disk device 1 includes a plurality of disks 11, a shield 10, a magnetic head 13, an arm 14, a guide blade 15, a device such as an actuator, and a housing 21. The housing 21 is divided into a disk side area 2 in which the disks 11, a rotation shaft 12, etc. are accommodated, and a device side area 3 in which the devices such as the magnetic head 13, the arm 14, and the actuator are accommodated. Figure 1A state is illustrated in which the disk 11 rotates counterclockwise around the rotation axis 12 and the magnetic head 13 is located on the surface of the disk 11 to read and write data.

[0030] The housing 21 is filled with a dielectric gas such as air and helium. The housing 21 can seal the dielectric gas.

[0031] The shroud 10 is provided inside the shell 21, and the shroud 10 at least partially surrounds the disk 11 along the outer edge of the disk 11 with a gap therebetween. A guide vane 15 is also provided inside the shell 21. In the area where the shroud 10 extends along the disk 11, the gap between the shroud 10 and the disk 11 is preferably 0.1 mm or more and 1.0 mm or less. The shroud 10 is a cover of the disk 11, and its Figure 1 As shown, it at least partially surrounds the disk 11. The guide vanes 15 are guide members for the air flow and are, for example, shield walls.

[0032] A plurality of disks 11 as recording media having a disk shape are stacked together. The number of disks 11 may vary according to specifications. In addition, the disk 11 may have a single-sided or double-sided magnetic layer; however, in the present embodiment, the magnetic layer will be described as a double-sided type. A plurality of disks 11 may be rotatable along a rotation direction by a rotation axis and stacked with a predetermined gap along the rotation axis direction. As used herein, the description is given based on the assumption that the main surface of the disk 11 is a "disk surface", which includes the front surface and the back surface of the disk 11.

[0033] The rotating shaft 12 is a rotating shaft that rotates the disk 11. The rotating shaft 12 is connected to a driving motor (not shown) and rotates the disk 11, which is fixed to the rotating shaft 12 and is arranged to be rotatably driven around the rotating shaft 12 serving as a central axis. The rotation speed of the disk 11 achieved by driving the rotating shaft 12 is generally several thousand rpm to tens of thousands rpm; however, the rotation speed of the disk 11 in the present embodiment is not limited to this range. In the present embodiment, Figure 1 The counterclockwise direction in is described as the rotation direction of the disk 11.

[0034] The magnetic head 13 reads data recorded on the disk 11 and writes data to the disk 11. The magnetic head 13 is provided at a distal end of the arm 14. Figure 2 is along Figure 1. The magnetic heads 13 and the disks 11 are arranged alternately. The magnetic heads 13 located above the disks 11 can read and write (hereinafter, read / write) to the upper surface (front surface) of the corresponding disk 11, each magnetic head 13 located between the corresponding disks 11 can read / write to the lower surface (back surface) of the corresponding disk 11 located above the magnetic head and read / write to the front surface of the corresponding disk 11 located below the magnetic head 13, and the magnetic head 13 located below the disk 11 can read / write to the back surface of the corresponding disk 11 located above the magnetic head 13. Figure 3 1 is an example of a schematic diagram of a magnetic disk device when the disk stops. When the disk 11 stops rotating, the magnetic head 13 and the arm 14 stop and retract from the corresponding disk 11, as shown in FIG. Figure 3 As shown. When the rotating shaft 12 is rotatably driven to rotate the disk 11, each magnetic head 13 floats a predetermined amount (for example, about 10 nm) from the surface of the corresponding disk 11 due to the airflow generated in the rotation direction of the disk 11 by centrifugal force and surface viscosity, has the position of the arm 6 controlled by the actuator, and reads / writes data from / to the portion of the magnetic layer of the disk 11 facing the magnetic head 13. The disk 11 facing the magnetic head 13 corresponds to the disk 11 located directly above the magnetic head 13 and the disk 11 located directly below the magnetic head 13. That is, the magnetic head 13 reads / writes information from / to the opposite disk 11.

[0035] The arm 14 is a member that supports the magnetic heads 13. Each of the magnetic heads 13 provided at the distal end of the arm 14 is arranged to be able to enter a corresponding gap in the stacking direction of the disks 11.

[0036] The actuator controls the driving of the arm 14 to control the position of the head 13 relative to the disk 11. The actuator is included in Figure 1 In the device A in . Examples of the actuator include a voice coil motor, a stepping motor, etc.; however, the actuator in the present embodiment is not limited thereto.

[0037] The guide blade 15 is provided between the disk side area 2 and the device side area 3. The guide blade 15 is connected to the shroud 10 on the downstream side of the airflow generated in the rotation direction of the disk 11. That is, one end of the guide blade 15 is connected to the end of the shroud 10 on the downstream side of the flow near the disk surface of the disk 11. Here, with respect to the flow flowing near the disk surface of the disk 11 along with the rotation of the disk 11, the vicinity of the flow flowing from the device side area 3 into the disk side area 2 is referred to as "upstream of the flow" (upstream of the flow near the disk surface), and the vicinity of the flow flowing from the disk side area 2 into the device side area 3 is referred to as "downstream of the flow". In addition, the end of the shroud 10 refers to both ends of the shroud 10 along the disk 11. The end of the shroud 10 exists in two positions, that is, on the upstream side and the downstream side of the flow near the disk surface. In addition, "one end of the guide blade 15 is connected to the shroud 10" means that it is only necessary that at least a part of the guide blade 15 is in contact with the shroud 10 to have a continuous configuration. Another component or the like may be included between the guide blade 15 and the shroud 10. For example, even if a support member for supporting the guide vane 15 is provided between the guide vane 15 and the shroud 10, it is only necessary that the shroud 10 is configured integrally with the guide vane 15 and has a series of configurations capable of guiding the flows 102 and 103 to be described later. The guide vane 15 and the shroud 10 may be made of the same material and formed integrally, or may be made of different materials. In addition, the other end of the guide vane 15 is located on the downstream side of the flow near the disk 11 compared to the end connected to the shroud 10. The guide vane 15 is arranged substantially along the disk 11. Here, it is described as "substantially along the disk 11" because the gap between the guide vane 15 and the disk 11 is not completely constant and varies depending on the position. Figure 4 yes Figure 1 15 is an enlarged view of the vicinity of the guide vane 15 in FIG. The guide vane 15 includes a guide vane connection portion 15a located at a portion connected to the shroud, a guide vane distal portion 15c (which is a portion located at the distal end on the downstream side of the flow near the disk 11), and a guide vane central portion 15b located at an intermediate portion between the guide vane connection portion 15a and the guide vane distal portion 15c. An area 16 (gap) is provided between the guide vane 15 and the disk 11. Depending on the position, the area 16 includes an area 16a located between the disk 11 and the guide vane connection portion 15a, an area 16b located between the disk 11 and the guide vane central portion 15b, and an area 16c located between the disk 11 and the guide vane distal portion 15c.

[0038] In region 16, the shortest distance from a point on the curved surface of the guide vane 15 facing the disk 11 to the disk 11 is defined as the distance d16 between the guide vane 15 and the disk 11. Further, the shortest distance from a point on the curved surface of the shroud 10 facing the disk 11 to the disk 11 is defined as the distance between the shroud 10 and the disk 11. At this time, d16 is greater than the distance between the shroud 10 and the disk 11. Additionally, d16 increases as the distance from the guide vane connection portion 15a increases. That is, when the distance between the guide vane 15 and the disk 11 in region 16a is represented by d16a, the distance between the guide vane 15 and the disk 11 in region 16b is represented by d16b, and the distance between the guide vane 15 and the disk 11 in region 16c is represented by d16c, the guide vane 15 is arranged to satisfy the relationship d16a < d16b < d16c. Hereinafter, this structure may be described as "a structure in which d16 gradually increases". In the present embodiment, the maximum value of d16c is preferably 1.0 mm or less, more preferably 0.8 mm or less.

[0039] The airflows generated inside the disk will be described below. Figure 5 is Figure 1 a schematic view of the inside of the disk device, in which arrows indicating the flow of the airflow are added. Flows 101a and 101b are the flows near the disk surface caused by the disk 11 during the rotation of the disk 11. As used herein, flows 101a and 101b may be collectively referred to as flow 101. Flow 102 is the flow caused by the rotation of the disk 11, which passes through the gap between the disk 11 and the shroud 10. Flow 103 is the flow passing through region 16. A part of flow 103 flows in the direction from the disk-side region 2 toward the device-side region 3 and becomes flows 104a and 104b. A part of flow 104a flows in the device-side region 3 to surround the device A including the actuator and the like. These flows are referred to as flows 105a to 105e. On the other hand, a part of flow 104b flows in the device-side region 3 to surround the device B different from the device A. These flows are referred to as flows 106a to 106c. Flow 107 is the flow passing through the device-side region 3 and flowing into the disk-side region 2 again. Flows 108a to 108b are a part of flow 103 flowing toward the disk-side region 2. As used herein, regarding the flow flowing near the disk surface of the disk 11 together with the rotation of the disk 11, the vicinity of flow 107 flowing from the device-side region 3 into the disk-side region 2 may be referred to as "the upstream of the flow", and the vicinity of flow 103 flowing from the disk-side region 2 into the device-side region 3 may be referred to as "the downstream of the flow". Additionally, the device A and the device B may be referred to as the device region A and the device region B, respectively.

[0040] As used herein, streams 104a - 104b may be collectively referred to as streams 104 , streams 105a - 105e may be collectively referred to as streams 105 , streams 106a - 106c may be collectively referred to as streams 106 , and streams 108a - 108b may be collectively referred to as streams 108 .

[0041] There is generally a problem that the flow passing through the device-side area 3 flows again into the disk-side area 2 while carrying particles having a particle size of about tens of nm to hundreds of nm in the device-side area 3. This is because, if the particles carried to the disk-side area 2 in this way adhere to the surface of the disk 11, various problems such as damage to the disk surface and data read / write errors may be caused.

[0042] According to the present embodiment, the flow from the disk side region 2 to the device side region 3 is reduced by the guide vanes 15 , so that the flow velocity of the flow 107 passing through the device side region 3 and flowing into the disk side region 2 again can be reduced.

[0043] In addition, the guide vane 15 in the present embodiment has a distance d16 between the guide vane 15 and the disk 11, which gradually increases from the root to the distal end of the guide vane 15. In the present embodiment, the structure in which the guide vane 15 decelerates the airflow refers to a structure in which d16 of the guide vane 15 gradually increases. In this structure, when the continuity equation is applied to the airflow (flow 103) between the guide vane 15 and the disk 11, the flow 103 is decelerated from the upstream to the downstream. However, the structure in which the guide vane 15 decelerates the airflow is not limited to this structure, and such a structure only needs to be able to decelerate the flow 103.

[0044] As flow 103 slows down, flow 104 also slows down. The slowing down of flow 104a slows down flow 105, and the slowing down of flow 104b slows down flow 106. The slowing down of flows 105 and 106 can reduce the amount of particles carried by the flows as they pass through device side region 3.

[0045] In addition, as the flow 103 slows down, the flow 108 also slows down, so that the airflow disturbance near the boundary between the disk side area 2 and the device side area 3 is also reduced. Therefore, it is possible to prevent particles near the outer edge of the disk side area 2 from being entrained by the flow 108. In addition, the pressure in the disk side area 2 near the device side area 3 increases, which reduces the pressure difference between the disk side area 2 and the device side area 3. The flow 109 from the device side area 3 toward the disk side area 2 caused by the pressure difference can therefore be reduced, so that the flow containing particles can be prevented from flowing into the disk side area 2.

[0046] In addition to reducing the amount of particles carried to the disk side region 2, the deceleration and disturbance reduction of the flows 104a and 108a can also reduce the vibration of the arm caused by the air flow. The vibration of the arm 14 supporting the head 13 is reduced in this way, so that the actuator can determine the position of the head 13 more accurately or more easily.

[0047] As described above, in the disk device of the present embodiment, the particles carried from the device side to the disk side can be reduced by providing the guide vanes having a predetermined shape. The vibration of the arm caused by the air flow can also be reduced.

[0048] The housing 21 and the shield 10 can be integrally formed and can be integrally manufactured during the manufacturing process. Similarly, the guide vanes 15 and the shield 10 can be integrally formed and can be integrally manufactured during the manufacturing process.

[0049] (Second Embodiment)

[0050] Reference will be made to Figure 6 describe a second embodiment partially modified from the first embodiment. In the description of the present embodiment, the same parts as those shown in the first embodiment are denoted by the same reference numerals; therefore, the description thereof will not be given again.

[0051] Figure 6 is an example of an enlarged view of the disk device in the present embodiment. In the present embodiment, the guide vane 15 has an air flow guiding portion 15d on the more downstream side of the flow 103 at the distal end portion 15c of the guide vane. For example, the air flow guiding portion 15d is a throttle portion. In the present embodiment, the region on the downstream side of the flow 103 in the guide vane 15 other than the air flow guiding portion 15d is described as the distal end portion 15c of the guide vane. As in the first embodiment, the relationship of d16a < d16b < d15c is also established in the present embodiment. However, the air flow guiding portion 15d faces the disk 11, so that when the distance between the air flow guiding portion 15d and the disk 11 is defined as d16d, d16d is less than the maximum value of d16c. In addition, d16d is preferably 50% or more of the maximum value of d16c, and more preferably 80% or more of the maximum value of d16c. It should be noted that d16d is greater than d16a.

[0052] The air flow generated inside the disk in the present embodiment will be described below. The flows 108c, 108d, and 108e are part of the flow 103 flowing toward the disk side region 2.

[0053] As in the first embodiment, the distance d16 between the guide vane 15 and the disk 11 in this embodiment satisfies d16a < d16b so as to decelerate the flow 103. It should be noted that d16d is designed to be at least 50% or more of the maximum value of d16c, preferably designed to be 80% or more of the maximum value of d16c, so as to prevent excessive re-acceleration of the flow 103. This structure enables the guide vane 15 to guide the direction of the flow that is part of the flow 103 flowing out from the region 16 while reducing the re-acceleration of the flow 103. Therefore, the presence of the air flow guiding portion 15d does not hinder the effect of decelerating the flow 103 by the guide vane 15.

[0054] According to this embodiment, the flow 103 is decelerated due to d16a < d16b, and the air flow guiding portion 15d provided at the end of the distal end portion 15c of the guide vane also faces the disk side region 2, so that a part of the flow 103 is guided to the flow 108c flowing closer to the center of the disk side region 2. This divides the flow 103 into "flow 108c" and "flows 108d and 108e at the outer edge portion of the disk". As a result, the flows 108d and 108e respectively have flow velocities smaller than those of the flows 108a and 108b. Therefore, it is possible to further prevent the particles near the outer edge of the disk side region 2 from being carried by the flows 108d and 108e. In addition, the flow velocities of the flows 104a and 104b are also reduced, so that the deceleration of the flow 104a decelerates the flow 105, and the deceleration of the flow 104b decelerates the flow 106. The deceleration of the flows 105 and 106 can reduce the amount of particles carried by the flow while passing through the device side region 3. In addition, the pressure in the disk side region 2 near the device side region 3 increases, which reduces the pressure difference between the disk side region 2 and the device side region 3. This can reduce the flow 109 from the device side region 3 toward the disk side region 2 caused by this pressure difference, so that it is possible to further prevent the flow containing particles from flowing into the disk side region 2.

[0055] Figure 7 Shows the amount of particles attached to the surface of the disk 11 when the disk 11 rotates for a certain period of time. Figure 7 Shows the measurement results of the particle adhesion amount relative to that when the disk device without the guide vane operates for the same period of time. Figure 7On the horizontal axis of the graph, the measurement result of the magnetic disk device without guide blades is indicated as "without guide blades", while the measurement result of the magnetic disk device with guide blades 15 according to the present embodiment is indicated as "Example 2". According to the results, the amount of particle adhesion to the disk 11 in the magnetic disk device with guide blades 15 according to the present embodiment is half or less of the amount of particle adhesion to the disk 11 in the magnetic disk device without guide blades. This is because the guide blades 15 reduce the flow velocity of the flow flowing from the disk side area 2 to the device side area 3, the flow 103 is decelerated due to d16 being greater than the distance between the shield 10 and the disk 11, wherein the structure in which d16 gradually increases in area 16 further decelerates the flow 103, and the airflow guide portion 15d guides a portion of the flow 103 closer to the center of the disk side area 2. Therefore, it can be seen that the guide blades 15 according to the present embodiment are capable of reducing the particles carried from the device side area 3 to the disk side area 2.

[0056] In addition, in addition to reducing the amount of particles carried to the disk side area 2, the deceleration and disturbance reduction of the stream 104a and the stream 108d can also reduce the vibration of the arm caused by the airflow. The vibration of the arm 14 supporting the magnetic head 13 is reduced in this way, so that the actuator can further more accurately or further more easily determine the position of the magnetic head 13.

[0057] As described above, in this embodiment, particles carried from the device side area 3 to the disk side area 2 can be reduced by providing the guide blades having a predetermined shape in the magnetic disk device. The vibration of the arm 14 caused by the air flow can also be further reduced.

[0058] (Third Embodiment)

[0059] The third embodiment will be described below. In the description of this embodiment, the same parts as those shown in the first and second embodiments are denoted by the same reference numerals; therefore, description thereof will not be given again.

[0060] In the present embodiment, the guide vane 15 has a surface which is a rough surface with fine asperities, grooves or protrusions. In the present embodiment, the guide vane 15 decelerates the airflow by the rough surface of the guide vane 15, which is a surface with fine asperities, grooves or protrusions. However, the structure in which the guide vane 15 decelerates the airflow is not limited to this structure, and such a structure only needs to be able to decelerate the flow 103. Asperities may also be referred to as roughness, irregularity, etc. The fine asperities, grooves or protrusions on the surface of the guide vane 15 increase the friction received by the flow 103 when the flow 103 passes through the area 16, so that the flow 103 is decelerated from upstream to downstream. Figure 8 is an example of a guide vane 15 having grooves on the surface. Figure 8 In the embodiment, the grooves are formed on the surface of the guide vanes 15 facing the disk 11 . Figure 8 The grooves in the guide vane 15 are arranged substantially parallel to the traveling direction of the flow 103; however, the shape and intervals of the grooves provided on the guide vane 15 are not particularly limited.

[0061] As described above, particles carried over from the device-side region 3 to the disk-side region 2 can be reduced by effectively decelerating the flow 103. The vibration of the arm 14 caused by the flow can also be further reduced.

[0062] However, the minute irregularities, grooves or protrusions in this embodiment are very small compared to d16, and thus the influence on the size of d16 is almost negligible.

[0063] It should be noted that the configuration according to the present embodiment can be used in combination with the first embodiment and the second embodiment.

[0064] A number of embodiments according to the present invention have been described herein; however, these embodiments are given as examples and are not intended to limit the scope of the present invention. In addition, the configurations according to the first to third embodiments illustrated herein may be used in any combination. Embodiments of the present invention may be implemented in various other forms, and various omissions, substitutions, and changes may be made without departing from the scope of the present invention. These embodiments and variations thereof are included in the scope and spirit of the present invention, and are also included in the present invention described in the claims and their equivalents.

[0065] [Note 1]

[0066] A magnetic disk device, comprising:

[0067] a disk rotatable in a rotation direction;

[0068] a shield at least partially surrounding the disk along the outer edge of the disk with a gap therebetween; and

[0069] a guide vane connected to the shroud on a downstream side of the airflow generated in the rotation direction,

[0070] The guide vane has a structure for decelerating an airflow between the guide vane and the disk.

[0071] [Claim 2]

[0072] The magnetic disk device according to Supplementary Note 1, wherein:

[0073] The distance between the guide vanes and the disk is greater than the distance between the shroud and the disk.

[0074] [Note 3]

[0075] The magnetic disk device according to Supplement 1 or 2, wherein:

[0076] The guide blade comprises:

[0077] a guide vane connection portion connected to the shroud;

[0078] a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow; and

[0079] a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion, and

[0080] The distance between the guide vane central portion and the disk is greater than the distance between the guide vane connecting portion and the disk.

[0081] [Note 4]

[0082] The magnetic disk device according to any one of Supplementary Notes 1 to 3, wherein:

[0083] The guide blade comprises:

[0084] a guide vane connection portion connected to the shroud;

[0085] a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow; and

[0086] a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion, and

[0087] The distance between the guide vane center portion and the disk is greater than the distance between the guide vane connection portion and the disk, and the distance between the guide vane distal end portion and the disk is greater than the distance between the guide vane center portion and the disk.

[0088] [Note 5]

[0089] The magnetic disk device according to any one of Supplementary Notes 1 to 4, wherein:

[0090] The guide blade comprises:

[0091] a guide vane connection portion connected to the shroud;

[0092] a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow;

[0093] a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion; and

[0094] an airflow guide portion located further downstream of the flow than the distal end portion of the guide vane, and

[0095] The distance between the guide vane center portion and the disk is greater than the distance between the guide vane connecting portion and the disk, and the distance between the airflow guiding portion and the disk is smaller than the distance between the guide vane distal end portion and the disk.

[0096] [Note 6]

[0097] The magnetic disk device according to any one of Supplementary Notes 1 to 5, wherein:

[0098] The guide vane has concavities, grooves or protrusions on the surface.

[0099] [Note 7]

[0100] A magnetic disk device, comprising:

[0101] a disk configured to be rotatably driven by a rotation axis;

[0102] a shield at least partially surrounding the disk along the outer edge of the disk with a gap therebetween; and

[0103] a guide vane having one end connected to an end of the shroud;

[0104] Wherein, the distance between the guide vane and the disk is greater than the distance between the shroud and the disk.

[0105] [Note 8]

[0106] The magnetic disk device according to any one of supplementary notes 1 to 7, comprising:

[0107] shell;

[0108] a magnetic head that reads data recorded on the disk and writes data to the disk;

[0109] an arm having the magnetic head at a distal end; and

[0110] an actuator that controls the position of the magnetic head;

[0111] The housing includes the disk, the shroud, the guide vanes, the magnetic head, the arm and the actuator inside.

Claims

1. A magnetic disk device, comprising: a disk rotatable in a rotation direction; a shield at least partially surrounding the disk along the outer edge of the disk with a gap therebetween; as well as a guide vane connected to the shroud on a downstream side of the airflow generated in the rotation direction, The guide vane has a structure for decelerating an airflow between the guide vane and the disk.

2. The magnetic disk device according to claim 1, wherein The distance between the guide vanes and the disk is greater than the distance between the shroud and the disk.

3. The magnetic disk device according to claim 1 or 2, wherein: The guide blade comprises: a guide vane connection portion connected to the shroud; a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow; and a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion, and The distance between the guide vane central portion and the disk is greater than the distance between the guide vane connecting portion and the disk.

4. The magnetic disk device according to any one of claims 1 to 3, wherein: The guide blade comprises: a guide vane connection portion connected to the shroud; a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow; and a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion, and The distance between the guide vane central portion and the disk is greater than the distance between the guide vane connecting portion and the disk, and the distance between the guide vane distal portion and the disk is greater than the distance between the guide vane central portion and the disk.

5. The magnetic disk device according to any one of claims 1 to 4, wherein: The guide blade comprises: a guide vane connection portion connected to the shroud; a guide vane distal portion which is a portion located at a distal end on a downstream side of the flow; a guide vane central portion located between the guide vane connecting portion and the guide vane distal portion; and an airflow guide portion located further downstream of the flow than the distal end portion of the guide vane, and The distance between the guide vane center portion and the disk is greater than the distance between the guide vane connecting portion and the disk, and the distance between the airflow guiding portion and the disk is smaller than the distance between the guide vane distal end portion and the disk.

6. The magnetic disk device according to any one of claims 1 to 5, wherein: The guide vane has concavities, grooves or protrusions on the surface.

7. The magnetic disk device according to any one of claims 1 to 6, further comprising: shell; a magnetic head that reads data recorded on the disk and writes data to the disk; an arm having said magnetic head at a distal end; as well as an actuator that controls the position of the magnetic head; The housing includes the disk, the shroud, the guide vanes, the magnetic head, the arm and the actuator inside.

8. A magnetic disk device, comprising: a disk configured to be rotatably driven by a rotation axis; a shield at least partially surrounding the disk along the outer edge of the disk with a gap therebetween; as well as a guide vane having one end connected to an end of the shroud; Wherein, the distance between the guide vane and the disk is greater than the distance between the shroud and the disk.

9. The magnetic disk device according to claim 8, further comprising: shell; a magnetic head that reads data recorded on the disk and writes data to the disk; an arm having said magnetic head at a distal end; as well as an actuator that controls the position of the magnetic head; The housing includes the disk, the shroud, the guide vanes, the magnetic head, the arm and the actuator inside.

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